Central European Time (CET) is a time zone that is one hour ahead of Coordinated Universal Time (UTC+1). It is used in many countries across Central Europe, including Germany, France, and Italy. CET is typically observed during the winter months, from the last Sunday in October to the last Sunday in March. During the summer, many countries switch to Central European Summer Time (CEST), which is UTC+2. This change helps to make better use of daylight during the longer days of summer. People in CET regions adjust their clocks forward one hour in March and back one hour in October.